Cornerpiece for frames



A N HEM. D. R, EQTUART CORNER'IIECE FOR FRAMES Filed Jan 11, 1955 2 Sheets-Sheet l ISnventor 0 5 fiua/"f D. R STUART CORNERP IECE FOR FRAMES 2 Sheets-Sheet 2 Filed Jan. 11, 1935 Zinnentor Patented Apr. 28, 1936 UNITED H 2,039,125 7 CORNERPIECE roa FRAMES )onald R ..jStuart, Omaha, Nebn, assignor to Helen P. Stuart, Omaha, Nebr.

Application January 11, 1935, Serial No. 1,426

7 7 Claims.

This invention relates to a corner piece for windows and doors in instances when strips of wood-or similar material is used for their rectangular frames, the metallic corner pieces being used upon the abutting ends of the strips in providing a rigid joint as a substitute for mortising.

Corner pieces of various kinds for this purpose have been in general use, especially in connection with the frames of window screens andscreen doors. The object ofthe present invention is to provide an improved corner piece which will forma joint of greater rigiditythan ordinary, and which, when mounted upon a frame, will. be disposed inwardly of the outer edges of thehorizontal and vertical frame-strips to permit reduction of size, byplaning or chamfering.

The invention includes such'a construction that the opposed sides and inner edges of these strips which form a joint will be engaged in socketmembers of the corner piece and that ordinary flanges maybe dispensed withfor supporting the strips, Also the invention includes acorner piece made from -a single metallic sheet for engaging bothsides of each frame-strip. 1

Other objects will be understood from the following description of the construction and operation in connection with the invention illustrated in the drawings and as claimed. o

In the drawings, Fig. 1 is aside view of a corner piece embodying my invention. Fig. 2 is a sectional view on line 2-- -2 of Fig.'5'to show the use of an inclined brace-plate.

Fig. 3 is a viewshowing that end of the corner piece opposite to the end thereof shown in Fig. 2.

Fig. 4 is a sectional view on line '4-4 of Fig. 1. Fig. 5 is a view similar to the view shown-in Fig. l, a horizontal and a vertical frame-strip being added. Fig. 6 is a sectional view on line65 of Fig. 1 to show a channel in the brace-plate.

Fig. 7 is a perspective view of the corner-piece, and Fig. 8 is aplan view of a metallic blank used in forming the corner piece.

Referring now to the drawings for a more particular description, the invention is described in connection with a horizontal frame-strip 1 and an abutting, vertical frame-strip 8.

The corner piece consists of a metallic sheet incised and bentto provide a flat face-plate 9 approximately of triangular form and adapted to engage one of the sides of the horizontal and vertical frame-strips, and providing a supportingplate ll! having a horizontal part II and a vertical part l2 for engaging the sides of said framestrips opposite to said triangular face-plate 9.

The remainder of the metallic sheet provides a transversely inclined triangular brace-plate l3 extending at an acute-angle from an edge of the triangular face-plate 9 to the angular supporting-plate ID at the middle part thereoiand providing a horizontal triangular bearing-plate M extending from the inclined, triangular braceplate [3 to the horizontal part H of the angular supporting-plate l0, said metallic sheet alsopro viding a triangular vertical bearing-plate 15 extending from the transversely inclined triangular brace-plate [3 to the vertical part l2 of said angular supporting-plate I ll.

As thus described the horizontal wood strip l for a frame will be held between the upper 'part of the "face-plate 9 and the horizontal part H of the supporting-plate ill with its lower side resting upon the triangular'horizontal bearingplate I4, and by use of keepers [6 (Fig.5) which enter the frame-strip I through the metallic" parts said frame-strip will be firmlyheldin the normal position described.

Since the bearing-plate 14 extends from the horizontal part II of the supporting-plate l!) 'to the face-plate 9 it will tend to maintain said parts 9 and II in uniformly spaced relation and prevent spreading, and since the transversely inclined brace l3 extends from the face-plate 9 to both of the parts ['4 and 15 of the supportingplate'lfl it is considered that the corner piece has a very strong construction, and will resist stresses to advantage.

The proportion of parts for each corner piece and the form and arrangement of its parts are such that they may be interchanged andthey:

may be fitted upon any corner of a rectangular frame.

When the parts are "assembled, the vertical frame-strip 8 will rest upon the triangular bearing-plate I5 between members 9 and I2, and the U keepers l6 *are'used for securing the vertical frame-strip 8 in normal position, abutting upon the frame-strip 1. s a

It will be appreciated that since the corner- "piece may be made by use of a single metallic sheet, incised and bent to the form as described, manufacture may be of limited cost. Also since the transversely inclined brace-plate I3 is of triangular form and is disposed in the triangular space between the parts I! and i2 of the angular supporting-plate II], it will tend to prevent accumulation of dust and foreign substances between said parts.

It will be seen that a concavo-convex channel I! is formed in the free edge of the transversely inclined, triangular brace-plate [3 at its junction and parallel with the triangular face-plate 9, this being a feature of great advantage. If the thickness of the frame-strips l and 5 is not suffioient for a snug fit between the supports or plates 9 and Ill, an operator, by use of a pair of pliers, in a well known manner, may reduce the width of this channel so that the parts 9, H and I2 will suitably engage the opposed sides of the frame-strips.

While these frame-strips are generally of uniform thickness they may vary somewhat in this respect, and therefore the provision of the curved edge IT is important.

If the frame-strips have a thickness greater than the widths of the bearing-plates l4 and [5, the channel I! permits expansion so that the plates 9 and it will be disposed somewhat further apart for receiving therebetween and suitably engaging the frame-strips.

It is obvious that if the transversely curved edge I? for this brace-plate E3 was not provided, the slight change of form for said contraction or expansion, as above mentioned, could not be conveniently efiected.

It will be noted that the ends :r of the supporting-plate it terminate inwardly of the edge of the curved part i! of the brace-plate so that said ends ."c will not unduly resist the compression or expansion above mentioned.

While I have explained details of construction I do not limit myself to exactness in this respect, and changes may be made in form, size, proportions and minor details, said changes being within the scope of the invention as claimed.

It is obvious, since this corner piece is produced by use of a single metallic sheet and is provided with the inclined brace-plate and the two bearing-plates as described, operation will be practical if one of the plates 9 or it? was omitted. For instance, if the supporting-plate ID was dispensed with, the brace-plate I3 would provide an adequate support for the two bearingplates !4 and so that the abutting frame-strips would be firmly held in connected relation, the keepers 66 operating to secure the single triangular facing-plate to one of the sides of the framestrips. And likewise the supporting-plate 10 could be used and face-plate 9 omitted, one advantage being that the frame-strips may have any desired thickness if a single plate at one of their sides is used.

As shown in Fig. 8 of the drawings, the outline of the supporting-plate H] has the form of an obtuse angle in the blank metallic sheet, but when this blank is subjected to pressure in a die, the blank will readily become bent to the form shown in Fig. '7, said supporting plate having the form of a right angle.

I claim as my invention,

1. In a corner piece for the abutting horizontal and vertical strips of a frame, an integral metallic structure providing a pair of approximately parallel opposed side-plates, a horizontal triangular bearing-plate and a vertical triangular bearingplate, each bearing-plate extending from and disposed at approximately right angles to one of the side-plates, and a triangular brace-plate extending from the opposed side-plate to a junction with said bearing-plates.

2. In a corner piece for the abutting horizontal and vertical strips of a frame, an integral metallic structure providing a pair of opposed parallel side-plates, one of the side-plates having I a horizontal bearing-plate and a vertical bearing-plate extending toward the opposed sideplate, and a brace-plate extending at an acute angle from said opposed side-plate to a junction with the horizontal bearing-plate and vertical bearing-plate.

3. In a corner piece for the abutting ends of the horizontal and upright strips of a frame, an integral structure providing a pair of opposed side-plates, one of the side plates being provided with a horizontal bearing-plate and an upright bearing plate each extending toward the opposed side-plate, and a brace-plate extending from its junction with the opposed side-plate to a junction with said horizontal bearing-plate, the junction of said brace-plate with said opposed side-plate being of concavo-convex form.

4. In a corner piece for the abutting ends of the horizontal and upright strips of a frame, an integral structure providing a pair of opposed parallel side-plates, one of the side-plates being provided with a horizontal bearing-plate and an upright bearing plate, each bearing plate projecting at a right angle toward the opposed side plate, and a brace plate extending at a transverse inclination from the opposed side plate to said bearing plates and providing a longitudinal edge of concavo-convex form at its junction with said opposed side plate, said bearing plates being of such proportions that their ends terminate inwardly of said concavo-convex edge.

5. In a corner piece for the abutting horizontal and vertical strips of a frame, a metallic integral structure providing a pair of approximately parallel opposed side plates, a horizontal triangular bearing plate and a vertical triangular bearing plate, each bearing plate extending from one side plate toward the opposed side plate, and a triangular brace plate joined to and extending at an acute angle from the opposed side plat-e to a junction with said bearing plates, said junction of the brace plate with said opposed side plate providing a rectilinear edge of concavoconvex form in cross section.

6. In a corner piece for the abutting horizontal and vertical strips of a frame, a pair of opposed, parallel side plates, one of the side plates being provided with a horizontal bearing plate and a vertical bearing plate, and a brace plate having the form of an equilateral triangle joined at its respective edges to said opposed side plate, said horizontal bearing plate and said vertical bearing plate.

7. In a corner piece for the abutting horizontal and vertical strips of a frame, an integral metallic structure providing a side plate having a horizontal bearing plate and vertical bearing plate projecting from one of its sides, each bearing plate being of triangular form and disposed approximately at right angles to said side plate, and a triangular brace plate disposed inclinedly relative to the side plate and joined at two of its edges to said bearing plates.

DONALD R. STUART. 

